<template>
    <div class="login_container">
        <div class="login_box">
            <!-- 头像区域 -->
            <div class="avatar_box">
                <img src="../assets/logo.png" alt="">
            </div>
            <!-- 登录表单区域 -->
            <!-- ref:表单的引用对象 -->
            <el-form ref="loginRef" :model="loginForm" :rules="loginRules" label-width="0" class="login-form">
                <!-- 用户名 -->
                <el-form-item prop="username">
                    <el-input prefix-icon="iconfont icon-wodeguanzhu" v-model="loginForm.username"></el-input>
                </el-form-item>
                 <!-- 密码 -->
                <el-form-item prop="password">
                    <el-input prefix-icon="iconfont icon-mima" v-model="loginForm.password" type="password"></el-input>
                </el-form-item>
                <!-- 按钮 -->
                <el-form-item class="btn-area">
                    <el-button type="primary" @click="submitLoginForm">登录</el-button>
                    <el-button type="info" @click="resetLoginForm">重置</el-button>
                </el-form-item>
            </el-form>
        </div>
    </div>
</template>

<script>
export default {
  data () {
    // 自定义验证规则
    var checkWord = (rule, value, callback) => {
      if (!value) {
        return callback(new Error('该项不能为空'))
      }
      if (value.match(/\W/)) {
        callback(new Error('只接受字母、数字和下划线'))
      } else {
        callback()
      }
    }
    return {
      loginForm: {
        username: '',
        password: ''
      },
      loginRules: {
        username: [
          { required: true, message: '请输入用户名', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' },
          { validator: checkWord, trigger: 'blur' }
        ],
        password: [
          { required: true, message: '请输入密码', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' },
          { validator: checkWord, trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    submitLoginForm () {
      this.$refs.loginRef.validate(async (valid) => {
        //   console.log(valid)
        if (!valid) return

        const { data: res } = await this.$http.post('login', this.loginForm)
          .catch(err => {
            return { data: { status: 500, message: err } }
          })
        console.log('res', res)
        if (res.status !== 200) return this.$message.error('登录失败！')
        this.$message.success('登录成功！')
        // 1. 登录成功后的 token 保存到客户端的 sessionStorage 中(如果需要根据权限动态生成路由还需要保存路由到sessionStorage中，并通过addRouter动态添加路由)
        //    1.1 项目中除了登录之外的其他API接口，必须在登录之后才能访问
        //    1.2 token 只应在网站打开期间生效，所以将 token 保存在 sessionStorage 中
        window.sessionStorage.setItem('token', res.data.token)
        // 2. 通过编程时导航跳转到后台主页，路由地址是 /home
        this.$router.push('/home')
      })
    },
    resetLoginForm () {
      this.$refs.loginRef.resetFields()
    }
  }
}
</script>

<style lang="less" scoped>
.login_container {
    background-color: #2b4b6b;
    height: 100%;
}

.login_box {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    .avatar_box{
        position: absolute;
        left: 50%;
        transform: translate(-50%, -50%);
        width: 130px;
        height: 130px;
        border: 1px solid #eee;
        border-radius: 50%;
        padding: 10px;
        box-shadow: 0 0 10px #ddd;
        background-color: #fff;
        img {
            width: 100%;
            height: 100%;
            border-radius: 50%;
            background-color: #eee;
        }
    }
}

.login-form{
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
}

.btn-area{
    display: flex;
    justify-content: flex-end;
}
</style>
